* 3504, OLPC XO-4 - touchscreen, change to version 0.0.0.9, which caused a few more timing changes, requiring some fixes to the driver.

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* 3502, OLPC XO-4 - fix support for non-touchscreen SKUs, compatible with touchscreen SKUs, treats TOUCH_HD# signal as active high, since the touchscreen controller is pulling the signal low in normal operation, momentarily enables a pull-down in conflict against the permanent pull-up, in order to sample the signal properly. Requires a BOM change for C2. Harmless on C1. <trac>12391</trac>,